Mean Activity Coefficients for NaCl in the Mixtures Containing Ionic Liquids [Emim][MeSO3] + H2O and [Emim][EtSO4] + H2O at 298.15 K

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• 作者：Eliseo Amado-GonzalezMiguel A. Esteso ; Wilfred Gomez-Jaramillo
• 刊名：Journal of Chemical & Engineering Data
• 出版年：2017
• 出版时间：February 9, 2017
• 年：2017
• 卷：62
• 期：2
• 页码：752-761
• 全文大小：494K
• ISSN：1520-5134

文摘

Mean activity coefficient values for NaCl in the mixture (water + ionic liquid) (IL) as solvent (IL being 1-ethyl-3-methyl-imidazolium methanesulfonate, [Emim][MeSO₃] or 1-ethyl-3-methyl-imidazolium ethyl sulfate, [Emim][EtSO₄]) were determined from the electrode potential measurements of the cell: Na–(ISE) | NaCl (m_A), ILs (w), H₂O (1 – w) | Cl–(ISE) (ISE means ion selective electrode) at total ionic strengths ranging from 0.10 to 3.20 mol·kg^–1 and at 298.15 K. Different weight fractions (w) of ILs (w = 0.01, 0.05, 0.1, 0.2, 0.3 and 0.4) were used. Data were fitted to the Pitzer model and the ion interaction parameters β₀, β₁, and C^γ were calculated. The osmotic coefficients of the solvent (water + IL), the solvent activity, the excess Gibbs free energy for the system were calculated. The negative sign in the excess free energy for the NaCl + IL+ H₂O solvent mixture at 298.15 K suggests a spontaneous aggregation of {[Emim][MeSO₃] + H₂O} or {[Emim][EtSO₄] + H₂O}.